#define INCHES_PER_CENTIMETER 0.394
#define CENTIMETERD_PER_INCH 1 / INCHES_PER_CENTIMETER

#define QUARTS_PER_LITER 1.057
#define LITERS_PER_QUART 1 / QUARTS_PER_LITER

#define OUNCES_PER_GRAM 0.035
#define GRAMS_PER_OUNCE 1 / OUNCES_PER_GRAM
